OnceValues

aopt_shell::value

Struct OnceValues 

Source 
pub struct OnceValues<O> { /* private fields */ }
Expand description

Calls the given function and initialize the value upon first use.

Implementations§

Source§

impl<O> OnceValues<O>

Source

pub fn new<F>(handler: F) -> Self
where F: Fn(&O) -> Result<Vec<OsString>, Error> + 'static,

Trait Implementations§

Source§

impl<O> Values<O> for OnceValues<O>

Source§

type Err = Error

Source§

fn get_values(&self, opt: &O) -> Result<Vec<OsString>, Self::Err>

Auto Trait Implementations§

§

impl<O> !Freeze for OnceValues<O>

§

impl<O> !RefUnwindSafe for OnceValues<O>

§

impl<O> !Send for OnceValues<O>

§

impl<O> !Sync for OnceValues<O>

§

impl<O> Unpin for OnceValues<O>

§

impl<O> !UnwindSafe for OnceValues<O>

Blanket Implementations§

Source§

impl<T> Any for T
where T: 'static + ?Sized,

Source§

fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
Source§

impl<T> Borrow<T> for T
where T: ?Sized,

Source§

fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
Source§

impl<T> BorrowMut<T> for T
where T: ?Sized,

Source§

fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
Source§

impl<'a, C, T> DynamicCtorThenBuilderHelper<'a, C> for T
where C: Match<'a>,

Source§

fn into_ctor_then_builder<F, O1, R>( self, func: F, ) -> DynamicCtorThenBuilder<C, T, F>
where F: Fn(&mut C, &O1) -> Result<R, Error>,

Source§

impl<T> From<T> for T

Source§

fn from(t: T) -> T

Returns the argument unchanged.

Source§

impl<T> Instrument for T

Source§

fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided Span, returning an Instrumented wrapper. Read more
Source§

fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current Span, returning an Instrumented wrapper. Read more
Source§

impl<T, U> Into<U> for T
where U: From<T>,

Source§

fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Source§

impl<T, U> TryFrom<U> for T
where U: Into<T>,

Source§

type Error = Infallible

The type returned in the event of a conversion error.
Source§

fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
Source§

impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

Source§

type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
Source§

fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.
Source§

impl<T, K> WithDefaultHelper<T> for K

Source§

fn with_default<F>(self, func: F) -> WithDefault<T, F, K>
where F: Fn() -> T,

Source§

impl<T> WithSubscriber for T

Source§

fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided Subscriber to this type, returning a WithDispatch wrapper. Read more
Source§

fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default Subscriber to this type, returning a WithDispatch wrapper. Read more
Source§

impl<T> MayDebug for T